Pump



May 29, 1928.

J. W. GURLEY PUMP 2 Sheets-Sheet 1 lIl May 29, 1928. 1,671,240

J. w. GURLEY PUMP Filed July 14, '1924 `2 sheets-sheet 2 l I N VEN TOR. @HA/wv/z E);

Patented May 29', 1928.`

'UNITED STATES f 1,671,240 PATENT oFF-ICE.'

JOHN w. Guntar, or INDIANAroLIs, INDIANA, AssIGNon To mu'anocx Puur con- PANY, or INDIANAPOLIS, INDIANA, A coaroaATIoN or INnIANA.

PUMP;

Application led July 14, 1924. Serial No. 725,859.

It is ythe object of my invention to improve the operation of and to reduce friction between the moving parts of rotary pumps and fluid-pressure motors vof the type inwhich a rotary element is provided .with

a series of retractible blades, such rotary element rotating within a casing, the interior of .which is so shaped that the spaces between the blades are alternately expanded and contracted as the rotatable element is rotated.

A pump or fluid-pressure motor of thisl type is shown in my Patent No. 1,472,414,

" granted October 30, 1923; and the present invention consists of a modiiication of the type of pump shown in this patent, by which modification the operation of the pump is bettered and the wear of moving parts materially reduced.

I accomplish the objects above set forth by providing a cylindrical metal shell which is concentric with the interior of the pump-casing, which lies between the casing and the rotor, and which rotates with the same raverage angular velocity as does the- Figs. 6 to 10 inclusive are perspective views 1 of the casing endplate one of the rods.A

which limit the extent ofy relativerotation between the rotor and shell, a blade-shoe, a

blade, and the shell respectively.

The pump has a casing 10,. 'provided with a central cylindrical bore, andV .two l endplates' 11. The end plates contain bearings or a shaft 12 which passes through the cylindrical `bore of the casing ljpar'allel tobut displaced `from the axis of such cylindrical bore. Rigidly mounted on this shaft 12 is the rotor 13 which is provided with a plurality 'of pairs of retractible blades 14," preferably equally spaced around the cirvided with a cumference of the rotor andradially slidable lin grooves in such rotor. Preferably, 5s

eachv pairof blades 'are connected ltogether.'

Ais xed a bar by' one or more pins 15 which extend therein so thatwhen one blade of apair is forced inward of the rotor the opposite` blade will be positivelyi forcedoutward.

Rotatably mounted within the cylindrical bore of the casing 10 is 4a thin walled cylindrical shell 16, concentric with such bore and supported by means of two shellhubs, pressed vin the opposite ends'thereof for securing said shell and hubs together, each of which 'is provided with a projecting iange 18 which enters a suitable bearing recess in an end plate 11, asis clear from Fig. l.` The flange 18'may be-either integral with the shell-hub 17 or may be merely the extending end of a bushing' pressed into the bore of such shell-hub. The exterior diameter of the shell 16 is very slightly less than the diameter of the cylindrical bore of the casing 10. For reasons which -will later ap= pear, the shell 16 is provided with groups of longitudinally extending slots 16', the number of such groups beingequal to the number of blades inthe rotor 1,3, and the shell 16 being so angularly located relative to the rotor 13 that each group oi? slots 16' is substantially midway between two blades. As the axis of rotor-rotationl is eccentric to the cylindrical bore of the casing 10, l.'

prefer to provide on the outer edge of each blade 14 a rocking shoe 20, the exteriorsurface of which is a portion of a cylindricai surface of a diameter equal to the internal diameter ofthe shell 16. The inner surface of each shoe 20 is a convex cylindrical surface y resting in a correspondingly curved lgroove in the outer edge of its blade 14.

s the rotorv 13 'and shell 16 rotate within the casing 10, the shoes 20 roch in the grooves of the blades 14 so thatthe outer surfaces of such shoes are always in contact -through the rotor .and are radially slidable j with the inner surface of the (shell .16. As

the roter rotates, the distance between op# posite shoes 20 will vary. This variation is slight-too slight 'to be shown intthedraw .ings-and -it is taken care of by relative movement between the shoes andy their re spective blades in the manner described in my'prior Patent No. 1,472,414, mentioned above. y The outer surface-0f each shoe 20 is pro- 21 .which is longer than -Qthe shoe and which projects longitudinally be-- longitudinal groove in which yond eachend thereof. The lexterior surface of each bar 12 is finished to conform to the yexterior surface .of its shoe 20. vThe project# ing ends 'of the bars 21 extend into slots 22 formed in the 4periphery of the shell-hub V 17, which slots are of suicient circumferential extent to permit a limited relative movement of the rotor and shell. This relative movement of rotor and shell is necessary, be-

rotor willbe the same.l The different posi-` tions which the projecting ends of the bars 2l assume in the slots 22 as the rotor rotates is shown clearly in Fig. 2.

The casing l0 is provided with an inlet opening 25 and a discharge opening 26,-

which openings communicate respectively with passages 27 and 28 extending longitudinally of the casing. The'passages 27 and 28 communicate with'depressions 29 lin the end-plates 11, and these depressions 29 serve to connect the passages 27 'and' 28 with the interior of the shell 16.

It will be evident 'that as the. rotor 13 and shell 16 rotate within the casing 10,

the four compartments into which the space.

betweenl the rotor and shell is divided by the blades 14 will alternately increase and decrease in size. The depressions 29 in the plates 11 are so shaped that as the rotor vrotates in a clockwise direction (Fig. 3) the two spaces which are increasing inl size will communicate' with the fluid-passage 27 and the two spaces which are decreasin in lsize will both communicate with the uid assage 28. As each space increases in size, Enid 1s drawn in through the passage 27 to ll such space and when this space so filled begins to decrease in si'ze, the uid contained within it'will be positively forced into the passage 28 and out through the discharge 45- opening 26. Either opening 25 or 26 can serve as the inlet opening, and the other as the discharge opening, depending on the direction of rotor rotatlon.

of the stationary casing 10 but engage the interior surface of' the rotating sl1ell16,

there is but little wear-'on the exterior sul.-

faces of these shoes. The openings or slots 16 serve to balance the pressure Within and 55 without the shell 16 so that there is ,no tendency to distort such shell.

While I have described my `device as a'. pump, it is capable of eflicient use, without change, as a rotary fluid-pressure motor; and 6 my claim is intended to cover the device 'regardless ofthe use to which it may be put.

I claim as my invention IA'rotary pump, comprising a casing hav-` ing a cylindrical chamber, a hollow cylindrical shell rotatably mounted-within said chamber, said shell and chamber being coaxial, a rotor rotatable Within said shell on an axis eccentric to said chamber, a hub at j each end of said shell for supporting the same7 a plurality of slots formed adJacent the periphery of each of said hubs, and bars mounted in said rotor having theiru ends extending into said slots and slidable therein for. providing a lost motion driving connection therebetween, whereby said co-axial shell may be driven by said eccentric rotor. In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 10th i day of July, A. D. one thousand nine hun- 80V dred and twenty-four.

JOHN W. GURLEY.

.As the shoes 20 do notengage the interior 50 

